Nerve conduction studies reveal conduction block in the bilateral radial nerves.
| Motor | ||||||||
|---|---|---|---|---|---|---|---|---|
| Left | Right | |||||||
| Latency, ms | CV, m/s | Amplitude, mV | F-Latency, ms | Latency, ms | CV, m/s | Amplitude, mV | F-Latency ms | |
| Motor | ||||||||
| Median (APB) | ||||||||
| Erb’s | 14 | 60 | 12.6 | |||||
| Axilla | 8.3 | 58 | 13.6 | 9.6 | 66.7 | 9.5 | ||
| Elbow | 7.1 | 55 | 14.5 | 7.5 | 53.5 | 10.2 | ||
| Wrist | 2.9 | 15.6 | 28.8 | 3.2 | 10.5 | 25.1 | ||
| Ulnar (ADM) | ||||||||
| Erb’s | 14 | 60 | 7.6 | |||||
| Axilla | 9.2 | 54 | 8.5 | 9.4 | 83.3 | 4.8 | ||
| Ab elbow | 8 | 50 | 9.2 | 8.2 | 47.6 | 4.5 | ||
| Bel elbow | 5.6 | 47 | 9.7 | 6.1 | 55.1 | 5.2 | ||
| Wrist | 2.6 | 10.4 | 29.6 | 2.2 | 5.5 | 29.3 | ||
| Radial (EIP) | ||||||||
| Plexus | 8.7 | 2.5 | ||||||
| Ab elbow | 3 | 2.8 | 4.5 | 76.5 | 3.6 | |||
| Bel elbow | 2 | 7.3 | 2.8 | 10.8 | ||||
| Peroneal (EDB) | ||||||||
| Pop fos | 12.8 | 44 | 5.6 | |||||
| Fib head | 11.2 | 41 | 7.2 | |||||
| Ankle | 3.8 | 8.2 | 61.8 | |||||
| Tibial (AHB) | ||||||||
| Pop fos | 11.8 | 56 | 5.4 | |||||
| Ankle | 4.8 | 6.6 | 55.1 | |||||
| Sensory | ||||||||
| Median palm - wrist | 1.3 | 61 | 38.7 | 1.4 | 59.3 | 55.5 | ||
| Median dig II - wrist | 2.0 | 11.8 | 2.1 | 25.9 | ||||
| Radial - forearm | 1.7 | 59 | 9.8 | 1.1 | 92.6 | 19.9 | ||
| Ulnar palm - wrist | 1.0 | 67 | 17.4 | |||||
| Ulnar dig V - wrist | 1.5 | 14.8 | ||||||
| Sural foreleg - ankle | 2.8 | 50 | 17.4 | |||||
CV: conduction velocity; F-latency: F-wave; APB: abductor pollicis brevis; ADM: abductor digiti/minimi; EIP: extensor indicis proprius; EDB: extensor digitorum brevis; AHB: abductor hallucis brevis.